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Studies of the π-electron distribution in push–pull alkenes by 1H and 13C NMR spectroscopy—II

✍ Scribed by E. Kleinpeter; St. Thomas; G. Uhlig; W.-D. Rudorf

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
575 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

A wide variety of push–pull alkenes were studied by means of variable‐temperature ^1^H and ^13^C NMR spectroscopy with respect to the configuration/conformation and the barriers to rotation about partial CC and CN double bonds. For the assignment of the ^13^C NMR spectra especially the semi‐selective INEPT pulse sequence and an incremental system for estimating the ^13^C chemical shift values of aromatic carbon atoms proved useful. The influence of thioether, sulphone and sulphoxide moieties in the acceptor part of the push–pull system on the π‐electron distribution is critically considered.

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